@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;700&family=Outfit:wght@300;400;500;600;700;800&display=swap');

/* ==========================================
   1. DESIGN SYSTEM & VARIABLE DEFINITIONS
   ========================================== */
:root {
  /* Common Core Tokens */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  --border-radius-full: 9999px;
  --max-width: 1200px;
  
  /* Accent Gradients */
  --accent-primary: #4facfe;
  --accent-primary-gradient: linear-gradient(135deg, #4facfe, #00f2fe);
  --accent-teal: #00f2fe;
  --accent-violet: #8a2be2;
  --gradient-primary: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
  --gradient-secondary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
  --gradient-accent: linear-gradient(135deg, #8a2be2 0%, #f857a6 100%);
  --shadow-neon-teal: 0 0 20px rgba(0, 242, 254, 0.25);
  --shadow-neon-primary: 0 0 20px rgba(79, 172, 254, 0.25);
}

/* --- Dark Theme Tokens (Default) --- */
[data-theme="dark"] {
  --bg-primary: #0b0f19;
  --bg-secondary: #131b2e;
  --bg-tertiary: rgba(20, 26, 42, 0.55);
  --bg-card: rgba(25, 33, 56, 0.45);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(0, 242, 254, 0.3);
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --glass-blur: blur(16px);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --scrollbar-bg: #0b0f19;
  --scrollbar-thumb: #1e293b;
  --scrollbar-thumb-hover: #334155;
  --overlay-bg: rgba(7, 10, 18, 0.8);
}

/* --- Light Theme Tokens --- */
[data-theme="light"] {
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: rgba(255, 255, 255, 0.7);
  --bg-card: rgba(255, 255, 255, 0.85);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-color-hover: rgba(79, 172, 254, 0.3);
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --glass-blur: blur(12px);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.06);
  --scrollbar-bg: #f8f9fa;
  --scrollbar-thumb: #e2e8f0;
  --scrollbar-thumb-hover: #cbd5e1;
  --overlay-bg: rgba(248, 249, 250, 0.85);
}

/* ==========================================
   2. CSS RESET & UTILITIES
   ========================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--border-radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.grid {
  display: grid;
  gap: 24px;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Premium Glassmorphism Utility */
.glass {
  background: var(--bg-tertiary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  box-shadow: var(--glass-shadow);
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-normal);
}

.glass-card:hover {
  border-color: var(--border-color-hover);
  transform: translateY(-4px);
}

/* Canvas background containment */
#canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.6;
}

/* ==========================================
   3. HEADER & NAVIGATION
   ========================================== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: padding var(--transition-normal), background-color var(--transition-normal);
}

header.scrolled {
  background-color: var(--bg-tertiary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--glass-shadow);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
  transition: height var(--transition-normal);
}

header.scrolled .nav-container {
  height: 60px;
}

.logo {
  font-family: var(--font-sans);
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -1px;
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-menu {
  display: flex;
  gap: 32px;
  list-style: none;
  align-items: center;
}

.nav-link {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  padding: 6px 0;
  cursor: pointer;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-secondary);
  transition: width var(--transition-normal);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after, .nav-link:hover::after {
  width: 100%;
}

.theme-toggle-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glass-shadow);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.theme-toggle-btn:hover {
  transform: scale(1.1);
  border-color: var(--border-color-hover);
}

.theme-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
  transition: transform var(--transition-normal);
}

[data-theme="light"] .theme-icon-sun {
  display: none;
}
[data-theme="dark"] .theme-icon-moon {
  display: none;
}

/* ==========================================
   4. HERO SECTION
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 100px;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(79, 172, 254, 0.1);
  border: 1px solid rgba(79, 172, 254, 0.2);
  border-radius: var(--border-radius-full);
  color: var(--accent-primary);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 24px;
  align-self: flex-start;
}

.hero-title-container {
  margin-bottom: 16px;
}

.hero-greeting {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.hero-title {
  font-size: clamp(3rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  color: var(--text-primary);
}

.hero-gradient-text {
  background: var(--gradient-secondary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-typewriter {
  font-family: var(--font-sans);
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--text-secondary);
  font-weight: 400;
  margin-bottom: 32px;
  height: 2.5rem;
}

.typewriter-cursor {
  display: inline-block;
  background-color: var(--accent-primary);
  width: 3px;
  height: 1.4em;
  margin-left: 4px;
  vertical-align: middle;
  animation: blink 0.7s infinite alternate;
}

@keyframes blink {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.hero-description {
  max-width: 600px;
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Premium Interactive Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

.btn-primary {
  background: var(--gradient-secondary);
  color: #ffffff;
  border: none;
  box-shadow: var(--shadow-neon-primary);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(79, 172, 254, 0.4);
}

.btn-secondary {
  background: var(--bg-tertiary);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  box-shadow: var(--glass-shadow);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--border-color-hover);
}

/* ==========================================
   5. SECTION SYSTEM & TIMELINE
   ========================================== */
section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  margin-bottom: 60px;
}

.section-subtitle {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 2px;
  display: block;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  letter-spacing: -1px;
}

/* Timeline Layout */
.about-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
}

@media (max-width: 968px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 2px solid var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -43px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: var(--border-radius-full);
  background-color: var(--bg-primary);
  border: 3px solid var(--accent-primary);
  transition: transform var(--transition-fast), background-color var(--transition-fast);
  z-index: 5;
}

.timeline-item:hover .timeline-marker {
  transform: scale(1.3);
  background-color: var(--accent-primary);
  box-shadow: var(--shadow-neon-primary);
}

.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: 6px;
}

.timeline-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.timeline-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 500;
  margin-bottom: 12px;
}

.timeline-content {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Skills Deck */
.skills-card {
  padding: 32px;
}

.skills-category {
  margin-bottom: 32px;
}

.skills-category:last-child {
  margin-bottom: 0;
}

.skills-title {
  font-size: 1rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skill-tag {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: var(--border-radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-tag:hover {
  transform: translateY(-2px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-neon-primary);
}

/* ==========================================
   6. PROJECTS SHOWROOM & FILTERING
   ========================================== */
.showroom-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-tabs {
  display: flex;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 6px;
  border-radius: var(--border-radius-sm);
}

.filter-tab {
  border: none;
  background: transparent;
  padding: 8px 16px;
  border-radius: calc(var(--border-radius-sm) - 2px);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  background: var(--accent-primary-gradient);
  color: #ffffff;
}

.search-wrapper {
  position: relative;
  min-width: 280px;
}

.search-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-sm);
  padding: 10px 16px 10px 40px;
  font-family: var(--font-sans);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-input:focus {
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-neon-primary);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  width: 16px;
  height: 16px;
  pointer-events: none;
  fill: currentColor;
}

/* Projects Grid & Spotlight Cards */
.projects-grid {
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
}

@media (max-width: 480px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  position: relative;
  padding: 32px;
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  --mouse-x: 50%;
  --mouse-y: 50%;
}

/* Border spotlight highlight layer */
.project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(
    400px circle at var(--mouse-x) var(--mouse-y),
    rgba(79, 172, 254, 0.12),
    transparent 40%
  );
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-card:hover::before {
  opacity: 1;
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 24px;
  z-index: 2;
}

.project-folder-icon {
  color: var(--accent-primary);
  width: 40px;
  height: 40px;
}

.project-links {
  display: flex;
  gap: 16px;
  align-items: center;
}

.project-icon-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.project-icon-link:hover {
  color: var(--accent-primary);
  transform: translateY(-2px);
}

.project-icon-link svg {
  width: 20px;
  height: 20px;
}

.project-card-body {
  flex-grow: 1;
  margin-bottom: 24px;
  z-index: 2;
}

.project-card-title {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  transition: color var(--transition-fast);
}

.project-card:hover .project-card-title {
  color: var(--accent-primary);
}

.project-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
}

.project-card-footer {
  z-index: 2;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================
   7. FOOTER & DETAILS
   ========================================== */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 60px 0;
  text-align: center;
  transition: background-color var(--transition-slow);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-socials {
  display: flex;
  gap: 24px;
}

.social-icon-link {
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-full);
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.social-icon-link:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  color: var(--text-primary);
  box-shadow: var(--shadow-neon-primary);
}

.social-icon-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.footer-status {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(79, 172, 254, 0.05);
  border-radius: var(--border-radius-full);
}

.status-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-primary);
  border-radius: var(--border-radius-full);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.5; }
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Scroll Animation classes */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}